/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.connector.jdbc.dialect;

import org.apache.flink.table.api.TableSchema;
import org.apache.flink.table.api.ValidationException;
import org.apache.flink.table.types.DataType;
import org.apache.flink.table.types.logical.DecimalType;
import org.apache.flink.table.types.logical.LogicalTypeRoot;
import org.apache.flink.table.types.logical.TimestampType;
import org.apache.flink.table.types.logical.VarBinaryType;

import java.util.List;

abstract class AbstractDialect implements JdbcDialect {

	@Override
	public void validate(TableSchema schema) throws ValidationException {
		for (int i = 0; i < schema.getFieldCount(); i++) {
			DataType dt = schema.getFieldDataType(i).get();
			String fieldName = schema.getFieldName(i).get();

			// TODO: We can't convert VARBINARY(n) data type to
			//  PrimitiveArrayTypeInfo.BYTE_PRIMITIVE_ARRAY_TYPE_INFO in LegacyTypeInfoDataTypeConverter
			//  when n is smaller than Integer.MAX_VALUE
			if (unsupportedTypes().contains(dt.getLogicalType().getTypeRoot()) ||
				(dt.getLogicalType() instanceof VarBinaryType
					&& Integer.MAX_VALUE != ((VarBinaryType) dt.getLogicalType()).getLength())) {
				throw new ValidationException(
					String.format("The %s dialect doesn't support type: %s.",
						dialectName(),
						dt.toString()));
			}

			// only validate precision of DECIMAL type for blink planner
			if (dt.getLogicalType() instanceof DecimalType) {
				int precision = ((DecimalType) dt.getLogicalType()).getPrecision();
				if (precision > maxDecimalPrecision()
					|| precision < minDecimalPrecision()) {
					throw new ValidationException(
						String.format("The precision of field '%s' is out of the DECIMAL " +
								"precision range [%d, %d] supported by %s dialect.",
							fieldName,
							minDecimalPrecision(),
							maxDecimalPrecision(),
							dialectName()));
				}
			}

			// only validate precision of DECIMAL type for blink planner
			if (dt.getLogicalType() instanceof TimestampType) {
				int precision = ((TimestampType) dt.getLogicalType()).getPrecision();
				if (precision > maxTimestampPrecision()
					|| precision < minTimestampPrecision()) {
					throw new ValidationException(
						String.format("The precision of field '%s' is out of the TIMESTAMP " +
								"precision range [%d, %d] supported by %s dialect.",
							fieldName,
							minTimestampPrecision(),
							maxTimestampPrecision(),
							dialectName()));
				}
			}
		}
	}

	public abstract int maxDecimalPrecision();

	public abstract int minDecimalPrecision();

	public abstract int maxTimestampPrecision();

	public abstract int minTimestampPrecision();

	/**
	 * Defines the unsupported types for the dialect.
	 *
	 * @return a list of logical type roots.
	 */
	public abstract List<LogicalTypeRoot> unsupportedTypes();
}
